Setting GPU rendering: CVMCompiler has now run for 5 hours
5 Hours loading kernel doesn't sound right, that should be the first indication that something is wrong.

Anyway your graphics card is too old and unsupported.

As stated in the Official Blender Manual only cards with GCN (Graphics Core Next) 2.0 or above are supported. 
That means Radeon HD 7790 and above, as stated in the linked Wikpedia article

The AMD 6750 is no longer supported. Also 1Gb of memory is very low for today's standards and you probably wouldn't get any benefit from GPU rendering anyway